
<!DOCTYPE HTML>
<html lang="" >
    <head>
        <meta charset="UTF-8">
        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
        <title>设备树 · GitBook</title>
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="description" content="">
        <meta name="generator" content="GitBook 3.2.3">
        
        
        
    
    
    <link rel="stylesheet" href="../../../gitbook/style.css">

    
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-chapter-fold/chapter-fold.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-katex/katex.min.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-alerts/style.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-emphasize/plugin.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-mermaid-gb3/mermaid/mermaid.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-codeblock-label/block.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-code/plugin.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-search-pro/search.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-click-reveal/click_reveal.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-expandable-chapters-interactive/expandable-chapters.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-highlight/website.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-search/search.css">
                
            
                
                <link rel="stylesheet" href="../../../gitbook/gitbook-plugin-fontsettings/website.css">
                
            
        

    

    
        
    
        
    
        
    
        
    
        
    
        
    


    

        
    
    
    <meta name="HandheldFriendly" content="true"/>
    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <link rel="apple-touch-icon-precomposed" sizes="152x152" href="../../../gitbook/images/apple-touch-icon-precomposed-152.png">
    <link rel="shortcut icon" href="../../../gitbook/images/favicon.ico" type="image/x-icon">

    
    <link rel="next" href="part-2.html" />
    
    
    <link rel="prev" href="intro.html" />
    

    </head>
    <body>
        
<div class="book">
    <div class="book-summary">
        
            
<div id="book-search-input" role="search">
    <input type="text" placeholder="Type to search" />
</div>

            
                <nav role="navigation">
                


<ul class="summary">
    
    

    

    
        
        
    
        <li class="chapter " data-level="1.1" data-path="../../../">
            
                <a href="../../../">
            
                    
                    实验简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.2" data-path="../../../notes/log.html">
            
                <a href="../../../notes/log.html">
            
                    
                    更新日志
            
                </a>
            

            
        </li>
    

    
        
        <li class="header">实验之前</li>
        
        
    
        <li class="chapter " data-level="2.1" data-path="../../pre-lab/env.html">
            
                <a href="../../pre-lab/env.html">
            
                    
                    环境部署
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.2" data-path="../../pre-lab/gdb.html">
            
                <a href="../../pre-lab/gdb.html">
            
                    
                    GDB 调试方法*
            
                </a>
            

            
        </li>
    

    
        
        <li class="header">实验指导</li>
        
        
    
        <li class="chapter " data-level="3.1" >
            
                <span>
            
                    
                    实验指导零
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.1.1" data-path="../../lab-0/guide/intro.html">
            
                <a href="../../lab-0/guide/intro.html">
            
                    
                    摘要
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.2" data-path="../../lab-0/guide/part-1.html">
            
                <a href="../../lab-0/guide/part-1.html">
            
                    
                    创建项目
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.3" data-path="../../lab-0/guide/part-2.html">
            
                <a href="../../lab-0/guide/part-2.html">
            
                    
                    移除标准库依赖
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.4" data-path="../../lab-0/guide/part-3.html">
            
                <a href="../../lab-0/guide/part-3.html">
            
                    
                    移除运行时环境依赖
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.5" data-path="../../lab-0/guide/part-4.html">
            
                <a href="../../lab-0/guide/part-4.html">
            
                    
                    编译为裸机目标
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.6" data-path="../../lab-0/guide/part-5.html">
            
                <a href="../../lab-0/guide/part-5.html">
            
                    
                    生成内核镜像
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.7" data-path="../../lab-0/guide/part-6.html">
            
                <a href="../../lab-0/guide/part-6.html">
            
                    
                    调整内存布局
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.8" data-path="../../lab-0/guide/part-7.html">
            
                <a href="../../lab-0/guide/part-7.html">
            
                    
                    重写程序入口点
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.9" data-path="../../lab-0/guide/part-8.html">
            
                <a href="../../lab-0/guide/part-8.html">
            
                    
                    使用 QEMU 运行
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.10" data-path="../../lab-0/guide/part-9.html">
            
                <a href="../../lab-0/guide/part-9.html">
            
                    
                    接口封装和代码整理
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.11" data-path="../../lab-0/guide/summary.html">
            
                <a href="../../lab-0/guide/summary.html">
            
                    
                    小结
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.2" >
            
                <span>
            
                    
                    实验指导一
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.2.1" data-path="../../lab-1/guide/intro.html">
            
                <a href="../../lab-1/guide/intro.html">
            
                    
                    摘要
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.2.2" data-path="../../lab-1/guide/part-1.html">
            
                <a href="../../lab-1/guide/part-1.html">
            
                    
                    什么是中断
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.2.3" data-path="../../lab-1/guide/part-2.html">
            
                <a href="../../lab-1/guide/part-2.html">
            
                    
                    RISC-V 中的中断
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.2.4" data-path="../../lab-1/guide/part-3.html">
            
                <a href="../../lab-1/guide/part-3.html">
            
                    
                    程序运行状态
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.2.5" data-path="../../lab-1/guide/part-4.html">
            
                <a href="../../lab-1/guide/part-4.html">
            
                    
                    状态的保存与恢复
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.2.6" data-path="../../lab-1/guide/part-5.html">
            
                <a href="../../lab-1/guide/part-5.html">
            
                    
                    进入中断处理流程
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.2.7" data-path="../../lab-1/guide/part-6.html">
            
                <a href="../../lab-1/guide/part-6.html">
            
                    
                    时钟中断
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.2.8" data-path="../../lab-1/guide/summary.html">
            
                <a href="../../lab-1/guide/summary.html">
            
                    
                    小结
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.3" >
            
                <span>
            
                    
                    实验指导二
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.3.1" data-path="../../lab-2/guide/intro.html">
            
                <a href="../../lab-2/guide/intro.html">
            
                    
                    摘要
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.2" data-path="../../lab-2/guide/part-1.html">
            
                <a href="../../lab-2/guide/part-1.html">
            
                    
                    动态内存分配
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.3" data-path="../../lab-2/guide/part-2.html">
            
                <a href="../../lab-2/guide/part-2.html">
            
                    
                    物理内存探测
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.4" data-path="../../lab-2/guide/part-3.html">
            
                <a href="../../lab-2/guide/part-3.html">
            
                    
                    物理内存管理
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.5" data-path="../../lab-2/guide/summary.html">
            
                <a href="../../lab-2/guide/summary.html">
            
                    
                    小结
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.4" >
            
                <span>
            
                    
                    实验指导三
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.4.1" data-path="../../lab-3/guide/intro.html">
            
                <a href="../../lab-3/guide/intro.html">
            
                    
                    摘要
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.2" data-path="../../lab-3/guide/part-1.html">
            
                <a href="../../lab-3/guide/part-1.html">
            
                    
                    从虚拟地址到物理地址
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.3" data-path="../../lab-3/guide/part-2.html">
            
                <a href="../../lab-3/guide/part-2.html">
            
                    
                    修改内核
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.4" data-path="../../lab-3/guide/part-3.html">
            
                <a href="../../lab-3/guide/part-3.html">
            
                    
                    实现页表
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.5" data-path="../../lab-3/guide/part-4.html">
            
                <a href="../../lab-3/guide/part-4.html">
            
                    
                    实现内核重映射
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.6" data-path="../../lab-3/guide/part-5.html">
            
                <a href="../../lab-3/guide/part-5.html">
            
                    
                    页面置换*
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.7" data-path="../../lab-3/guide/summary.html">
            
                <a href="../../lab-3/guide/summary.html">
            
                    
                    小结
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.5" >
            
                <span>
            
                    
                    实验指导四
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.5.1" data-path="../../lab-4/guide/intro.html">
            
                <a href="../../lab-4/guide/intro.html">
            
                    
                    摘要
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.2" data-path="../../lab-4/guide/part-1.html">
            
                <a href="../../lab-4/guide/part-1.html">
            
                    
                    线程和进程
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.3" data-path="../../lab-4/guide/part-2.html">
            
                <a href="../../lab-4/guide/part-2.html">
            
                    
                    线程的创建
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.4" data-path="../../lab-4/guide/part-3.html">
            
                <a href="../../lab-4/guide/part-3.html">
            
                    
                    线程的切换
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.5" data-path="../../lab-4/guide/part-4.html">
            
                <a href="../../lab-4/guide/part-4.html">
            
                    
                    线程的结束
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.6" data-path="../../lab-4/guide/part-5.html">
            
                <a href="../../lab-4/guide/part-5.html">
            
                    
                    内核栈
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.7" data-path="../../lab-4/guide/part-6.html">
            
                <a href="../../lab-4/guide/part-6.html">
            
                    
                    线程调度
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.8" data-path="../../lab-4/guide/summary.html">
            
                <a href="../../lab-4/guide/summary.html">
            
                    
                    小结
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.6" >
            
                <span>
            
                    
                    实验指导五
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.6.1" data-path="intro.html">
            
                <a href="intro.html">
            
                    
                    摘要
            
                </a>
            

            
        </li>
    
        <li class="chapter active" data-level="3.6.2" data-path="part-1.html">
            
                <a href="part-1.html">
            
                    
                    设备树
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.3" data-path="part-2.html">
            
                <a href="part-2.html">
            
                    
                    virtio
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.4" data-path="part-3.html">
            
                <a href="part-3.html">
            
                    
                    驱动和块设备驱动
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.5" data-path="part-4.html">
            
                <a href="part-4.html">
            
                    
                    文件系统
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.6" data-path="summary.html">
            
                <a href="summary.html">
            
                    
                    小结
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.7" >
            
                <span>
            
                    
                    实验指导六
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.7.1" data-path="../../lab-6/guide/intro.html">
            
                <a href="../../lab-6/guide/intro.html">
            
                    
                    摘要
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.2" data-path="../../lab-6/guide/part-1.html">
            
                <a href="../../lab-6/guide/part-1.html">
            
                    
                    构建用户程序框架
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.3" data-path="../../lab-6/guide/part-2.html">
            
                <a href="../../lab-6/guide/part-2.html">
            
                    
                    打包为磁盘镜像
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.4" data-path="../../lab-6/guide/part-3.html">
            
                <a href="../../lab-6/guide/part-3.html">
            
                    
                    解析 ELF 文件并创建线程
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.5" data-path="../../lab-6/guide/part-4.html">
            
                <a href="../../lab-6/guide/part-4.html">
            
                    
                    实现系统调用
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.6" data-path="../../lab-6/guide/part-5.html">
            
                <a href="../../lab-6/guide/part-5.html">
            
                    
                    处理文件描述符
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.7" data-path="../../lab-6/guide/part-6.html">
            
                <a href="../../lab-6/guide/part-6.html">
            
                    
                    条件变量
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.8" data-path="../../lab-6/guide/summary.html">
            
                <a href="../../lab-6/guide/summary.html">
            
                    
                    小结
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">实验题</li>
        
        
    
        <li class="chapter " data-level="4.1" data-path="../../lab-1/practice.html">
            
                <a href="../../lab-1/practice.html">
            
                    
                    实验一：中断
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.2" data-path="../../lab-2/practice.html">
            
                <a href="../../lab-2/practice.html">
            
                    
                    实验二：内存分配
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.3" data-path="../../lab-3/practice.html">
            
                <a href="../../lab-3/practice.html">
            
                    
                    实验三：虚实地址转换
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.4" data-path="../../lab-4/practice-1.html">
            
                <a href="../../lab-4/practice-1.html">
            
                    
                    实验四（上）：线程
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.5" data-path="../../lab-4/practice-2.html">
            
                <a href="../../lab-4/practice-2.html">
            
                    
                    实验四（下）：线程调度
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.6" data-path="../../lab-6/practice.html">
            
                <a href="../../lab-6/practice.html">
            
                    
                    实验六：系统调用
            
                </a>
            

            
        </li>
    

    
        
        <li class="header">开发笔记</li>
        
        
    
        <li class="chapter " data-level="5.1" data-path="../../format/partition.html">
            
                <a href="../../format/partition.html">
            
                    
                    文档代码划分
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.2" data-path="../../format/doc.html">
            
                <a href="../../format/doc.html">
            
                    
                    文档格式规范
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.3" data-path="../../format/code.html">
            
                <a href="../../format/code.html">
            
                    
                    代码格式规范
            
                </a>
            

            
        </li>
    

    

    <li class="divider"></li>

    <li>
        <a href="https://www.gitbook.com" target="blank" class="gitbook-link">
            Published with GitBook
        </a>
    </li>
</ul>


                </nav>
            
        
    </div>

    <div class="book-body">
        
            <div class="body-inner">
                
                    

<div class="book-header" role="navigation">
    

    <!-- Title -->
    <h1>
        <i class="fa fa-circle-o-notch fa-spin"></i>
        <a href="../../.." >设备树</a>
    </h1>
</div>




                    <div class="page-wrapper" tabindex="-1" role="main">
                        <div class="page-inner">
                            
<div id="book-search-results">
    <div class="search-noresults">
    
<div id="book-search-results">
    <div class="search-noresults">
    
                                <section class="normal markdown-section">
                                
                                <h2 id="&#x8BBE;&#x5907;&#x6811;">&#x8BBE;&#x5907;&#x6811;</h2>
<h3 id="&#x4ECE;&#x54EA;&#x91CC;&#x8BFB;&#x53D6;&#x8BBE;&#x5907;&#x4FE1;&#x606F;">&#x4ECE;&#x54EA;&#x91CC;&#x8BFB;&#x53D6;&#x8BBE;&#x5907;&#x4FE1;&#x606F;</h3>
<p>&#x65E2;&#x7136;&#x6211;&#x4EEC;&#x8981;&#x5B9E;&#x73B0;&#x628A;&#x6570;&#x636E;&#x653E;&#x5728;&#x67D0;&#x4E2A;&#x5B58;&#x50A8;&#x8BBE;&#x5907;&#x4E0A;&#x5E76;&#x8BA9;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x6765;&#x8BFB;&#x53D6;&#xFF0C;&#x9996;&#x5148;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x5C31;&#x8981;&#x6709;&#x4E00;&#x4E2A;&#x8BFB;&#x53D6;&#x5168;&#x90E8;&#x5DF2;&#x63A5;&#x5165;&#x8BBE;&#x5907;&#x4FE1;&#x606F;&#x7684;&#x80FD;&#x529B;&#xFF0C;&#x800C;&#x8BBE;&#x5907;&#x4FE1;&#x606F;&#x653E;&#x5728;&#x54EA;&#x91CC;&#x53C8;&#x662F;&#x8C01;&#x5E2E;&#x6211;&#x4EEC;&#x6765;&#x505A;&#x7684;&#x5462;&#xFF1F;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#x5176;&#x5B9E;&#x5728;<a href="../../lab-2/guide/part-2.html">&#x7269;&#x7406;&#x5185;&#x5B58;&#x63A2;&#x6D4B;</a>&#x4E2D;&#x5C31;&#x63D0;&#x5230;&#x8FC7;&#xFF0C;&#x5728; RISC-V &#x4E2D;&#xFF0C;&#x8FD9;&#x4E2A;&#x4E00;&#x822C;&#x662F;&#x7531; bootloader&#xFF0C;&#x5373; OpenSBI &#x56FA;&#x4EF6;&#x5B8C;&#x6210;&#x7684;&#x3002;&#x5B83;&#x6765;&#x5B8C;&#x6210;&#x5BF9;&#x4E8E;&#x5305;&#x62EC;&#x7269;&#x7406;&#x5185;&#x5B58;&#x5728;&#x5185;&#x7684;&#x5404;&#x5916;&#x8BBE;&#x7684;&#x626B;&#x63CF;&#xFF0C;&#x5C06;&#x626B;&#x63CF;&#x7ED3;&#x679C;&#x4EE5;<strong>&#x8BBE;&#x5907;&#x6811;&#x4E8C;&#x8FDB;&#x5236;&#x5BF9;&#x8C61;&#xFF08;DTB&#xFF0C;Device Tree Blob&#xFF09;</strong>&#x7684;&#x683C;&#x5F0F;&#x4FDD;&#x5B58;&#x5728;&#x7269;&#x7406;&#x5185;&#x5B58;&#x4E2D;&#x7684;&#x67D0;&#x4E2A;&#x5730;&#x65B9;&#x3002;&#x800C;&#x8FD9;&#x4E2A;&#x653E;&#x7F6E;&#x7684;&#x7269;&#x7406;&#x5730;&#x5740;&#x5C06;&#x653E;&#x5728; <code>a1</code> &#x5BC4;&#x5B58;&#x5668;&#x4E2D;&#xFF0C;&#x800C;&#x5C06;&#x4F1A;&#x628A; HART ID &#xFF08;<strong>HART&#xFF0C;Hardware Thread&#xFF0C;&#x786C;&#x4EF6;&#x7EBF;&#x7A0B;&#xFF0C;&#x53EF;&#x4EE5;&#x7406;&#x89E3;&#x4E3A;&#x6267;&#x884C;&#x7684; CPU &#x6838;</strong>&#xFF09;&#x653E;&#x5728; <code>a0</code> &#x5BC4;&#x5B58;&#x5668;&#x4E0A;&#x3002;</p>
<p>&#x5728;&#x6211;&#x4EEC;&#x4E4B;&#x524D;&#x7684;&#x51FD;&#x6570;&#x4E2D;&#x5E76;&#x6CA1;&#x6709;&#x4F7F;&#x7528;&#x8FC7;&#x8FD9;&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x5982;&#x679C;&#x8981;&#x4F7F;&#x7528;&#xFF0C;&#x6211;&#x4EEC;&#x4E0D;&#x9700;&#x8981;&#x4FEE;&#x6539;&#x4EFB;&#x4F55;&#x5165;&#x53E3;&#x6C47;&#x7F16;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x53EA;&#x9700;&#x8981;&#x7ED9; <code>rust_main</code> &#x51FD;&#x6570;&#x589E;&#x52A0;&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#x5373;&#x53EF;&#xFF1A;</p>
<p></p><p class="code-label">os/src/main.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// Rust &#x7684;&#x5165;&#x53E3;&#x51FD;&#x6570;</span>
<span class="hljs-comment">///</span>
<span class="hljs-comment">/// &#x5728; `_start` &#x4E3A;&#x6211;&#x4EEC;&#x8FDB;&#x884C;&#x4E86;&#x4E00;&#x7CFB;&#x5217;&#x51C6;&#x5907;&#x4E4B;&#x540E;&#xFF0C;&#x8FD9;&#x662F;&#x7B2C;&#x4E00;&#x4E2A;&#x88AB;&#x8C03;&#x7528;&#x7684; Rust &#x51FD;&#x6570;</span>
<span class="hljs-meta">#[no_mangle]</span>
<span class="hljs-keyword">pub</span> <span class="hljs-keyword">extern</span> <span class="hljs-string">&quot;C&quot;</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">rust_main</span></span>(_hart_id: usize, dtb_pa: PhysicalAddress) -&gt; ! {
    memory::init();
    interrupt::init();
    drivers::init(dtb_pa);
    ...
}
</code></pre>
<p>&#x6253;&#x5370;&#x8F93;&#x51FA;&#x4E00;&#x4E0B;&#xFF0C;<code>dtb_pa</code> &#x53D8;&#x91CF;&#x7EA6;&#x5728; 0x82200000 &#x9644;&#x8FD1;&#xFF0C;&#x800C;&#x5185;&#x6838;&#x7ED3;&#x675F;&#x7684;&#x5730;&#x5740;&#x7EA6;&#x4E3A; 0x80b17000&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x5728;&#x6211;&#x4EEC;&#x5185;&#x6838;&#x7684;&#x540E;&#x9762;&#x653E;&#x7740;&#xFF0C;&#x8FD9;&#x610F;&#x5473;&#x7740;&#x5F53;&#x6211;&#x4EEC;&#x5185;&#x6838;&#x4EE3;&#x7801;&#x8D85;&#x8FC7; 32MB &#x7684;&#x65F6;&#x5019;&#x5C31;&#x4F1A;&#x51FA;&#x73B0;&#x95EE;&#x9898;&#xFF0C;&#x5728;&#x66F4;&#x597D;&#x7684;&#x5B9E;&#x73B0;&#x4E2D;&#xFF0C;&#x5176;&#x5B9E; OpenSBI &#x56FA;&#x4EF6;&#x542F;&#x52A8;&#x7684;&#x5E94;&#x8BE5;&#x662F;&#x7B2C;&#x4E8C;&#x7EA7;&#x5C0F;&#x5DE7;&#x7684; Bootloader&#xFF0C;&#x800C;&#x6211;&#x4EEC;&#x73B0;&#x5728;&#x5168;&#x90E8;&#x5185;&#x6838;&#x5185;&#x5BB9;&#x90FD;&#x5728;&#x5185;&#x5B58;&#x4E2D;&#x4E14;&#x4E5F;&#x6CA1; 32MB &#x90A3;&#x4E48;&#x5927;&#xFF0C;&#x6211;&#x4EEC;&#x6682;&#x65F6;&#x4E0D;&#x7406;&#x4F1A;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#x3002;</p>
<h3 id="&#x8BBE;&#x5907;&#x6811;">&#x8BBE;&#x5907;&#x6811;</h3>
<p>&#x4E0A;&#x9762;&#x63D0;&#x5230; OpenSBI &#x56FA;&#x4EF6;&#x4F1A;&#x628A;&#x8BBE;&#x5907;&#x4FE1;&#x606F;&#x4EE5;&#x8BBE;&#x5907;&#x6811;&#x7684;&#x683C;&#x5F0F;&#x653E;&#x5728;&#x67D0;&#x4E2A;&#x5730;&#x5740;&#x4E0A;&#xFF0C;&#x54EA;&#x8BBE;&#x5907;&#x6811;&#x683C;&#x5F0F;&#x7A76;&#x7ADF;&#x662F;&#x600E;&#x6837;&#x7684;&#x5462;&#xFF1F;&#x5728;&#x5404;&#x79CD;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x4E2D;&#xFF0C;&#x6211;&#x4EEC;&#x6253;&#x5F00;&#x8BBE;&#x5907;&#x7BA1;&#x7406;&#x5668;&#xFF08;Windows&#xFF09;&#x548C;&#x7CFB;&#x7EDF;&#x62A5;&#x544A;&#xFF08;macOS&#xFF09;&#x7B49;&#x5185;&#x7F6E;&#x7684;&#x7CFB;&#x7EDF;&#x8F6F;&#x4EF6;&#x5C31;&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x6211;&#x4EEC;&#x4F7F;&#x7528;&#x7684;&#x7535;&#x8111;&#x7684;&#x8BBE;&#x5907;&#x6811;&#xFF0C;&#x4E00;&#x4E2A;&#x5178;&#x578B;&#x7684;&#x8BBE;&#x5907;&#x6811;&#x5982;&#x4E0B;&#x56FE;&#x6240;&#x793A;&#xFF1A;</p>
<div align="center"> <img src="../pics/device-tree.png" style="zoom:40%;"> </div>

<p>&#x6BCF;&#x4E2A;&#x8BBE;&#x5907;&#x5728;&#x7269;&#x7406;&#x4E0A;&#x8FDE;&#x63A5;&#x5230;&#x4E86;&#x7236;&#x8BBE;&#x5907;&#x4E0A;&#x6700;&#x540E;&#x518D;&#x901A;&#x8FC7;&#x603B;&#x7EBF;&#x7B49;&#x8FDE;&#x63A5;&#x8D77;&#x6765;&#x6784;&#x6210;&#x4E00;&#x6574;&#x4E2A;&#x8BBE;&#x5907;&#x6811;&#xFF0C;&#x5728;&#x6BCF;&#x4E2A;&#x8282;&#x70B9;&#x4E0A;&#x90FD;&#x63CF;&#x8FF0;&#x4E86;&#x5BF9;&#x5E94;&#x8BBE;&#x5907;&#x7684;&#x4FE1;&#x606F;&#xFF0C;&#x5982;&#x652F;&#x6301;&#x7684;&#x534F;&#x8BAE;&#x662F;&#x4EC0;&#x4E48;&#x7C7B;&#x578B;&#x7B49;&#x7B49;&#x3002;&#x800C;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x5C31;&#x662F;&#x901A;&#x8FC7;&#x8FD9;&#x4E9B;&#x8282;&#x70B9;&#x4E0A;&#x7684;&#x4FE1;&#x606F;&#x6765;&#x5B9E;&#x73B0;&#x5BF9;&#x8BBE;&#x5907;&#x7684;&#x8BC6;&#x522B;&#x7684;&#x3002;</p>
<blockquote>
<p><strong>[info] &#x8BBE;&#x5907;&#x8282;&#x70B9;&#x5C5E;&#x6027;</strong></p>
<p>&#x5177;&#x4F53;&#x800C;&#x8A00;&#xFF0C;&#x4E00;&#x4E2A;&#x8BBE;&#x5907;&#x8282;&#x70B9;&#x4E0A;&#x4F1A;&#x6709;&#x51E0;&#x4E2A;&#x6807;&#x51C6;&#x5C5E;&#x6027;&#xFF0C;&#x8FD9;&#x91CC;&#x7B80;&#x8981;&#x4ECB;&#x7ECD;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x7528;&#x5230;&#x7684;&#x51E0;&#x4E2A;&#xFF1A;</p>
<ul>
<li>compatible&#xFF1A;&#x8BE5;&#x5C5E;&#x6027;&#x6307;&#x7684;&#x662F;&#x8BE5;&#x8BBE;&#x5907;&#x7684;&#x7F16;&#x7A0B;&#x6A21;&#x578B;&#xFF0C;&#x4E00;&#x822C;&#x683C;&#x5F0F;&#x4E3A; &quot;manufacturer,model&quot;&#xFF0C;&#x5206;&#x522B;&#x6307;&#x4E00;&#x4E2A;&#x51FA;&#x5382;&#x6807;&#x7B7E;&#x548C;&#x5177;&#x4F53;&#x6A21;&#x578B;&#x3002;&#x5982; &quot;virtio,mmio&quot; &#x6307;&#x7684;&#x662F;&#x8FD9;&#x4E2A;&#x8BBE;&#x5907;&#x901A;&#x8FC7; virtio &#x534F;&#x8BAE;&#x3001;MMIO&#xFF08;&#x5185;&#x5B58;&#x6620;&#x5C04; I/O&#xFF09;&#x65B9;&#x5F0F;&#x6765;&#x9A71;&#x52A8;</li>
<li>model&#xFF1A;&#x6307;&#x7684;&#x662F;&#x8BBE;&#x5907;&#x751F;&#x4EA7;&#x5546;&#x7ED9;&#x8BBE;&#x5907;&#x7684;&#x578B;&#x53F7;</li>
<li>reg&#xFF1A;&#x5F53;&#x4E00;&#x4E9B;&#x5F88;&#x957F;&#x7684;&#x4FE1;&#x606F;&#x6216;&#x8005;&#x6570;&#x636E;&#x65E0;&#x6CD5;&#x7528;&#x5176;&#x4ED6;&#x6807;&#x51C6;&#x5C5E;&#x6027;&#x6765;&#x5B9A;&#x4E49;&#x65F6;&#xFF0C;&#x53EF;&#x4EE5;&#x7528; reg &#x6BB5;&#x6765;&#x81EA;&#x5B9A;&#x4E49;&#x5B58;&#x50A8;&#x4E00;&#x4E9B;&#x4FE1;&#x606F;</li>
</ul>
<p>&#x8BBE;&#x5907;&#x6811;&#x662F;&#x4E00;&#x4E2A;&#x6BD4;&#x8F83;&#x590D;&#x6742;&#x7684;&#x6807;&#x51C6;&#xFF0C;&#x66F4;&#x591A;&#x7EC6;&#x8282;&#x53EF;&#x4EE5;&#x53C2;&#x8003; <a href="https://elinux.org/Device_Tree_Reference" target="_blank">Device Tree Reference</a>&#x3002;</p>
</blockquote>
<h3 id="&#x89E3;&#x6790;&#x8BBE;&#x5907;&#x6811;">&#x89E3;&#x6790;&#x8BBE;&#x5907;&#x6811;</h3>
<p>&#x5BF9;&#x4E8E;&#x4E0A;&#x9762;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x6211;&#x4EEC;&#x4E0D;&#x9700;&#x8981;&#x81EA;&#x5DF1;&#x6765;&#x5B9E;&#x73B0;&#x8FD9;&#x4EF6;&#x4E8B;&#x60C5;&#xFF0C;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x8C03;&#x7528; rCore &#x4E2D; device_tree &#x5E93;&#xFF0C;&#x7136;&#x540E;&#x904D;&#x5386;&#x6811;&#x4E0A;&#x8282;&#x70B9;&#x5373;&#x53EF;&#xFF1A;</p>
<p></p><p class="code-label">os/src/drivers/device_tree.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// &#x9012;&#x5F52;&#x904D;&#x5386;&#x8BBE;&#x5907;&#x6811;</span>
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">walk</span></span>(node: &amp;Node) {
    <span class="hljs-comment">// &#x68C0;&#x67E5;&#x8BBE;&#x5907;&#x7684;&#x534F;&#x8BAE;&#x652F;&#x6301;&#x5E76;&#x521D;&#x59CB;&#x5316;</span>
    <span class="hljs-keyword">if</span> <span class="hljs-keyword">let</span> <span class="hljs-literal">Ok</span>(compatible) = node.prop_str(<span class="hljs-string">&quot;compatible&quot;</span>) {
        <span class="hljs-keyword">if</span> compatible == <span class="hljs-string">&quot;virtio,mmio&quot;</span> {
            virtio_probe(node);
        }
    }
    <span class="hljs-comment">// &#x904D;&#x5386;&#x5B50;&#x6811;</span>
    <span class="hljs-keyword">for</span> child <span class="hljs-keyword">in</span> node.children.iter() {
        walk(child);
    }
}

<span class="hljs-comment">/// &#x6574;&#x4E2A;&#x8BBE;&#x5907;&#x6811;&#x7684; Headers&#xFF08;&#x7528;&#x4E8E;&#x9A8C;&#x8BC1;&#x548C;&#x8BFB;&#x53D6;&#xFF09;</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">DtbHeader</span></span> {
    magic: <span class="hljs-keyword">u32</span>,
    size: <span class="hljs-keyword">u32</span>,
}

<span class="hljs-comment">/// &#x904D;&#x5386;&#x8BBE;&#x5907;&#x6811;&#x5E76;&#x521D;&#x59CB;&#x5316;&#x8BBE;&#x5907;</span>
<span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">init</span></span>(dtb_va: VirtualAddress) {
    <span class="hljs-keyword">let</span> header = <span class="hljs-keyword">unsafe</span> { &amp;*(dtb_va.<span class="hljs-number">0</span> <span class="hljs-keyword">as</span> *<span class="hljs-keyword">const</span> DtbHeader) };
    <span class="hljs-comment">// from_be &#x662F;&#x5927;&#x5C0F;&#x7AEF;&#x5E8F;&#x7684;&#x8F6C;&#x6362;&#xFF08;from big endian&#xFF09;</span>
    <span class="hljs-keyword">let</span> magic = u32::from_be(header.magic);
    <span class="hljs-keyword">if</span> magic == DEVICE_TREE_MAGIC {
        <span class="hljs-keyword">let</span> size = u32::from_be(header.size);
        <span class="hljs-comment">// &#x62F7;&#x8D1D;&#x6570;&#x636E;&#xFF0C;&#x52A0;&#x8F7D;&#x5E76;&#x904D;&#x5386;</span>
        <span class="hljs-keyword">let</span> data = <span class="hljs-keyword">unsafe</span> { slice::from_raw_parts(dtb_va.<span class="hljs-number">0</span> <span class="hljs-keyword">as</span> *<span class="hljs-keyword">const</span> <span class="hljs-keyword">u8</span>, size <span class="hljs-keyword">as</span> usize) };
        <span class="hljs-keyword">if</span> <span class="hljs-keyword">let</span> <span class="hljs-literal">Ok</span>(dt) = DeviceTree::load(data) {
            walk(&amp;dt.root);
        }
    }
}
</code></pre>
<p>&#x6CE8;&#xFF1A;&#x5728;&#x5F00;&#x59CB;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x6709;&#x4E00;&#x6B65;&#x6765;&#x9A8C;&#x8BC1; Magic Number&#xFF0C;&#x8FD9;&#x4E00;&#x6B65;&#x662F;&#x4E00;&#x4E2A;&#x4FDD;&#x8BC1;&#x7CFB;&#x7EDF;&#x53EF;&#x9760;&#x6027;&#x7684;&#x8981;&#x6C42;&#xFF0C;&#x662F;&#x4E3A;&#x4E86;&#x9A8C;&#x8BC1;&#x8FD9;&#x6BB5;&#x5185;&#x5B58;&#x5230;&#x5E95;&#x662F;&#x4E0D;&#x662F;&#x8BBE;&#x5907;&#x6811;&#x3002;&#x5728;&#x904D;&#x5386;&#x8FC7;&#x7A0B;&#x4E2D;&#xFF0C;&#x4E00;&#x65E6;&#x53D1;&#x73B0;&#x4E86;&#x4E00;&#x4E2A;&#x652F;&#x6301; &quot;virtio,mmio&quot; &#x7684;&#x8BBE;&#x5907;&#xFF08;&#x5176;&#x5B9E;&#x5C31;&#x662F; QEMU &#x6A21;&#x62DF;&#x7684;&#x5B58;&#x50A8;&#x8BBE;&#x5907;&#xFF09;&#xFF0C;&#x5C31;&#x8FDB;&#x5165;&#x4E0B;&#x4E00;&#x6B65;&#x52A0;&#x8F7D;&#x9A71;&#x52A8;&#x7684;&#x903B;&#x8F91;&#x3002;</p>
<p><div id="page-footer" class="localized-footer"><hr><p><link rel="stylesheet" href="https://unpkg.com/gitalk/dist/gitalk.css"></p>
<script src="https://unpkg.com/gitalk/dist/gitalk.min.js"></script>
<div id="gitalk-container"></div>
<script>
    var gitalk = new Gitalk({
        clientID: "5084c46751a4b2f7cd4d",
        clientSecret: "3904f62d33aef24f19480fedc836a48b31d532e9",
        repo: "rCore-Tutorial-deploy",
        owner: "rcore-os",
        admin: [
            "chyyuu",
            "wangrunji0408",
            "xy-plus",
            "wyfcyx",
            "LyricZhao",
            "Tuyixiang"
        ],
        id: location.pathname.replace('/rCore-Tutorial-deploy', '').replace('.html', ''),
        distractionFreeMode: false
    });
    gitalk.render("gitalk-container");
</script></div></p>

                                
                                </section>
                            
    </div>
    <div class="search-results">
        <div class="has-results">
            
            <h1 class="search-results-title"><span class='search-results-count'></span> results matching "<span class='search-query'></span>"</h1>
            <ul class="search-results-list"></ul>
            
        </div>
        <div class="no-results">
            
            <h1 class="search-results-title">No results matching "<span class='search-query'></span>"</h1>
            
        </div>
    </div>
</div>

    </div>
    <div class="search-results">
        <div class="has-results">
            
            <h1 class="search-results-title"><span class='search-results-count'></span> results matching "<span class='search-query'></span>"</h1>
            <ul class="search-results-list"></ul>
            
        </div>
        <div class="no-results">
            
            <h1 class="search-results-title">No results matching "<span class='search-query'></span>"</h1>
            
        </div>
    </div>
</div>

                        </div>
                    </div>
                
            </div>

            
                
                <a href="intro.html" class="navigation navigation-prev " aria-label="Previous page: 摘要">
                    <i class="fa fa-angle-left"></i>
                </a>
                
                
                <a href="part-2.html" class="navigation navigation-next " aria-label="Next page: virtio">
                    <i class="fa fa-angle-right"></i>
                </a>
                
            
        
    </div>

    <script>
        var gitbook = gitbook || [];
        gitbook.push(function() {
            gitbook.page.hasChanged({"page":{"title":"设备树","level":"3.6.2","depth":2,"next":{"title":"virtio","level":"3.6.3","depth":2,"path":"docs/lab-5/guide/part-2.md","ref":"docs/lab-5/guide/part-2.md","articles":[]},"previous":{"title":"摘要","level":"3.6.1","depth":2,"path":"docs/lab-5/guide/intro.md","ref":"docs/lab-5/guide/intro.md","articles":[]},"dir":"ltr"},"config":{"gitbook":"*","theme":"default","variables":{},"plugins":["hide-element","chapter-fold","katex","alerts","emphasize","mermaid-gb3","codeblock-label","code","search-pro","click-reveal","expandable-chapters-interactive","localized-footer"],"pluginsConfig":{"chapter-fold":{},"emphasize":{},"codeblock-label":{},"search-pro":{},"search":{},"localized-footer":{"filename":"gitalk.html","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"code":{"copyButtons":true},"hide-element":{},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":1},"click-reveal":{},"highlight":{},"mermaid-gb3":{},"expandable-chapters-interactive":{},"alerts":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"}},"file":{"path":"docs/lab-5/guide/part-1.md","mtime":"2020-10-01T11:39:40.519Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2020-10-01T11:40:38.595Z"},"basePath":"../../..","book":{"language":""}});
        });
    </script>
</div>

        
    
    <script src="../../../gitbook/gitbook.js"></script>
    <script src="../../../gitbook/theme.js"></script>
    
        
        <script src="../../../gitbook/gitbook-plugin-hide-element/plugin.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-chapter-fold/chapter-fold.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-alerts/plugin.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-mermaid-gb3/book/plugin.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-code/plugin.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-search-pro/jquery.mark.min.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-search-pro/search.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-click-reveal/click_reveal.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-expandable-chapters-interactive/expandable-chapters.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-search/search-engine.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-search/search.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-lunr/lunr.min.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-lunr/search-lunr.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-sharing/buttons.js"></script>
        
    
        
        <script src="../../../gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
        
    

    <script src="../../../gitbook/gitbook-plugin-mermaid-gb3/mermaid/mermaid.min.js"></script>

    </body>
</html>

